Just a few hours after the birth of a baby, the mammary glands start producing milk. which hormone stimulates this event

The correct answer is the prolactin hormone.

Explanation:

Prolactin (PRL) or luteotropic hormone is a hormone,  known for its different roles in enabling mammals, especially females. It is secreted in response to nursing, ovulation or mating, from the pituitary gland. Prolactin is manufactured by the pituitary gland in the brain.

Prolactin is majorly used to help women producing milk after a few hours of childbirth. The stimulation of the nipples and mammary gland leads to the release of prolactin.

Thus, the correct answer is the prolactin hormone.

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